Yes. I have noticed battery loss after it has been sitting several days. Enough to raise an eyebrow, anyway. It never bothered me too much though, I always top up the batteries the day before, and also bring the charger with me when warranted. Just wanted to let you know it's not just you.

Paul Szilard wrote:

I have 2 D4 batteries. I always put the camera away in its Pelikan case, with a full battery, and the camera body turned OFF. I also ensure that Network is also turned OFF.

In spite of this, my D4 battery that is in the body, seems to discharge slowly. I don't have exact measurements, but I would estimate that in 1 month of OFF time, the battery would loose about 15-20% of its charge. I have put my battery on Reclibrate, today.